From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51312) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ewT4f-0005ZZ-Pm for qemu-devel@nongnu.org; Thu, 15 Mar 2018 09:37:42 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ewT4b-0004nG-Dd for qemu-devel@nongnu.org; Thu, 15 Mar 2018 09:37:41 -0400 Received: from [112.64.68.174] (port=39096 helo=robinhe-hp.sh.intel.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ewT4a-0004kw-Ot for qemu-devel@nongnu.org; Thu, 15 Mar 2018 09:37:37 -0400 From: junyan.he@intel.com Date: Tue, 13 Mar 2018 16:33:46 +0800 Message-Id: <1520930033-18885-4-git-send-email-junyan.he@intel.com> In-Reply-To: <1520930033-18885-1-git-send-email-junyan.he@intel.com> References: <1520930033-18885-1-git-send-email-junyan.he@intel.com> Subject: [Qemu-devel] [PATCH 03/10] RFC: Implement save and support snapshot dependency in block driver layer. List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: kwolf@redhat.com, mreitz@redhat.com, pbonzini@redhat.com, crosthwaite.peter@gmail.com, quintela@redhat.com, rth@twiddle.net, dgilbert@redhat.com, famz@redhat.com, Junyan He From: Junyan He Signed-off-by: Junyan He --- block/snapshot.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ include/block/snapshot.h | 7 +++++++ 2 files changed, 52 insertions(+) diff --git a/block/snapshot.c b/block/snapshot.c index eacc1f1..8cc40ac 100644 --- a/block/snapshot.c +++ b/block/snapshot.c @@ -401,6 +401,51 @@ int bdrv_snapshot_load_tmp_by_id_or_name(BlockDriverState *bs, return ret; } +int bdrv_snapshot_save_dependency(BlockDriverState *bs, + const char *depend_snapshot_id, + int64_t depend_offset, + int64_t depend_size, + int64_t offset, + Error **errp) +{ + BlockDriver *drv = bs->drv; + + if (!drv) { + return -ENOMEDIUM; + } + + if (drv->bdrv_snapshot_save_dependency) { + return drv->bdrv_snapshot_save_dependency(bs, depend_snapshot_id, + depend_offset, depend_size, + offset, errp); + } + + if (bs->file) { + return bdrv_snapshot_save_dependency(bs->file->bs, depend_snapshot_id, + depend_offset, depend_size, + offset, errp); + } + + return -ENOTSUP; +} + +int bdrv_snapshot_support_dependency(BlockDriverState *bs, int32_t *alignment) +{ + BlockDriver *drv = bs->drv; + if (!drv || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { + return 0; + } + + if (drv->bdrv_snapshot_support_dependency) { + return drv->bdrv_snapshot_support_dependency(bs, alignment); + } + + if (bs->file != NULL) { + return bdrv_snapshot_support_dependency(bs->file->bs, alignment); + } + + return -ENOTSUP; +} /* Group operations. All block drivers are involved. * These functions will properly handle dataplane (take aio_context_acquire diff --git a/include/block/snapshot.h b/include/block/snapshot.h index f73d109..e5bf06f 100644 --- a/include/block/snapshot.h +++ b/include/block/snapshot.h @@ -73,6 +73,13 @@ int bdrv_snapshot_load_tmp(BlockDriverState *bs, int bdrv_snapshot_load_tmp_by_id_or_name(BlockDriverState *bs, const char *id_or_name, Error **errp); +int bdrv_snapshot_save_dependency(BlockDriverState *bs, + const char *depend_snapshot_id, + int64_t depend_offset, + int64_t depend_size, + int64_t offset, + Error **errp); +int bdrv_snapshot_support_dependency(BlockDriverState *bs, int32_t *alignment); /* Group operations. All block drivers are involved. -- 2.7.4